MAX3485E Datasheet

• ESD Protection for RS-485 I/O Pins
  • ±15kV-Human Body Model
  • ±8kV-IEC 1000-4-2, Contact Discharge
  • ±15kV-IEC 1000-4-2, Air-Gap Discharge
• Operate from a Single +3.3V Supply-No Charge Pump Required
• Interoperable with +5V Logic
• Guaranteed 12Mbps Data Rate (MAX3485E)
• 2nA Low-Current Shutdown Mode (MAX3485E)
• -7V to +12V Common-Mode Input Voltage Range
• Full-Duplex and Half-Duplex Versions Available
• Industry-Standard 75176 Pinout (MAX3485E)
• Current-Limiting and Thermal Shutdown for Driver Overload Protection

• Industrial Control Local Area Networks
• Integrated Services Digital Networks
• Packet Switching
• Telecommunications
• Transceivers for EMI-Sensitive Applications

The MAX3485E are ±15kV ESD-protected, +3.3V, low-power transceivers for RS-485 and RS-422 communications. Each device contains one driver and one receiver. The MAX3485E transmit at up to 12Mbps.

All devices feature enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge, and ±15kV using the Human Body Model.

Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if both inputs are open circuit.

The MAX3485E are designed for half-duplex communication.